To update the documentation and change tracking, Pulse needs to run its own TM1 processes (TI starting with }src). When Pulse starts, it checks if these processes are in the TM1 data folder, if they are not, it copies these processes into the TM1 data folder.

If you replace the TM1 data folder with an old one or one which does not have the }src processes, change tracking and update documentation will stop working.

What you need to do:

Restart Pulse services (Pulse will send the }src processes to the data folder).